Abstract
Extraction of starch from potato leads to formation of potato fruit juice (PFJ), which consists of proteins, fibers, starch and water. PFJ contains 1% - 3% [w/w] of proteins, including protease inhibitors that are potentially valuable for various applications, and could thus bring added value to the potato industry. The use of proteins of PFJ in bioactive form is limited by lack of benign and cost-efficient concentration technologies. The present approach combines a previously introduced low-temperature mechanical vapor compression evaporation technology with option to enzymatic viscosity management in case of high-viscosity fluids. In pilot-scale evaporation, an increase of solid content from 10% to 40% was achieved without major technical challenges. The proposed method offers a low-energy means for the concentration potato industry wastewater and reclamation of valuable proteins in active form.
Highlights
Starch industry in EU processes approximately 80 million tons of potatoes every year [1]
Extraction of starch from potato leads to formation of potato fruit juice (PFJ), which consists of proteins, fibers, starch and water
The solid content of the PFJ could be increased from below 10 up to 40% without major technical challenges (Table 3)
Summary
Starch industry in EU processes approximately 80 million tons of potatoes every year [1]. PFJ consists of 1% - 3% proteins from which half are valuable protease inhibitors (PIs) [2]. They are used for instance in weight loss promoting products and medicinal applications have been suggested [3] [4]. This situation has, been changing within the European Union due to novel regulations regarding both end-of waste criteria when processed as biodegradable waste and regulations for nitrogen content when spread to fields. Potato industry is looking for new opportunities that allow less cost intensive use of the side streams
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